{"title":"采用均匀表面扩散模型设计回收甲基二乙醇胺的吸附柱","authors":"P. Kannan, Priyabrata Pal, F. Banat","doi":"10.2516/ogst/2020073","DOIUrl":null,"url":null,"abstract":"A predictive simulation model was applied to design a fixed-bed adsorber for studying the removal of Total Organic Acid (TOA) anions from lean Methyldiethanolamine (MDEA) solution using Calcium Alginate Bentonite (CAB) clay hybrid composite adsorbent. Unlike other conventional techniques typically used for packed bed design, the predictive Homogeneous Surface Diffusion Model (HSDM) does not require any test column breakthrough curves a priori. Mass transfer coefficients and isotherm model parameters are provided as input data to HSDM for simulating column breakthrough curves. Various isotherm models were fitted to batch equilibrium data for TOA adsorption on CAB composite adsorbent. Based on Akaike Information Criterion (AIC), Freundlich isotherm was selected and the model parameters were obtained by non-linear regression. Film transfer coefficients and surface diffusivities were determined using appropriate empirical correlations available in the literature. HSDM predictions were first validated using lab-scale column adsorption data generated at lower residence times. The effects of dimensionless numbers (Biot and Stanton) on breakthrough times were investigated using the dimensionless HSDM system and a suitable scale-up regime (Bi& ~& 1 and St& >& 10) was established wherein the sensitivity of mass transfer parameters would be minimal. Using similitude rules on key design parameters, a pilot-scale adsorption column was designed and breakthrough curves were generated using the validated HSDM. 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引用次数: 5
摘要
采用预测模拟模型设计固定床吸附装置,研究海藻酸钙膨润土(CAB)粘土杂化复合吸附剂对贫甲基二乙醇胺(MDEA)溶液中总有机酸(TOA)阴离子的去除效果。与填充床设计的其他常规技术不同,预测均匀表面扩散模型(HSDM)不需要任何先验的测试柱突破曲线。将传质系数和等温线模型参数作为HSDM模拟柱突曲线的输入数据。采用不同的等温线模型拟合了CAB复合吸附剂吸附TOA的批量平衡数据。基于赤池信息准则(Akaike Information Criterion, AIC),选择Freundlich等温线,通过非线性回归得到模型参数。薄膜转移系数和表面扩散系数是用文献中可用的适当的经验相关性来确定的。HSDM预测首先通过较低停留时间产生的实验室规模柱吸附数据进行验证。使用无量纲HSDM系统研究了无量纲数(Biot和Stanton)对突破时间的影响,并建立了一个合适的放大范围(Bi& ~& 1和St& >& 10),其中传质参数的灵敏度最小。利用关键设计参数的相似规则,设计了中试吸附柱,并利用验证后的HSDM生成了突破曲线。通过将估计的突破数据和柱设计参数与传统的放大和动力学方法进行比较,验证了设计技术的适用性。
Design of adsorption column for reclamation of methyldiethanolamine using homogeneous surface diffusion model
A predictive simulation model was applied to design a fixed-bed adsorber for studying the removal of Total Organic Acid (TOA) anions from lean Methyldiethanolamine (MDEA) solution using Calcium Alginate Bentonite (CAB) clay hybrid composite adsorbent. Unlike other conventional techniques typically used for packed bed design, the predictive Homogeneous Surface Diffusion Model (HSDM) does not require any test column breakthrough curves a priori. Mass transfer coefficients and isotherm model parameters are provided as input data to HSDM for simulating column breakthrough curves. Various isotherm models were fitted to batch equilibrium data for TOA adsorption on CAB composite adsorbent. Based on Akaike Information Criterion (AIC), Freundlich isotherm was selected and the model parameters were obtained by non-linear regression. Film transfer coefficients and surface diffusivities were determined using appropriate empirical correlations available in the literature. HSDM predictions were first validated using lab-scale column adsorption data generated at lower residence times. The effects of dimensionless numbers (Biot and Stanton) on breakthrough times were investigated using the dimensionless HSDM system and a suitable scale-up regime (Bi& ~& 1 and St& >& 10) was established wherein the sensitivity of mass transfer parameters would be minimal. Using similitude rules on key design parameters, a pilot-scale adsorption column was designed and breakthrough curves were generated using the validated HSDM. The appropriateness of the design technique was verified by comparing the estimated breakthrough data and column design parameters with conventional scale-up and kinetic approaches.
期刊介绍:
OGST - Revue d''IFP Energies nouvelles is a journal concerning all disciplines and fields relevant to exploration, production, refining, petrochemicals, and the use and economics of petroleum, natural gas, and other sources of energy, in particular alternative energies with in view of the energy transition.
OGST - Revue d''IFP Energies nouvelles has an Editorial Committee made up of 15 leading European personalities from universities and from industry, and is indexed in the major international bibliographical databases.
The journal publishes review articles, in English or in French, and topical issues, giving an overview of the contributions of complementary disciplines in tackling contemporary problems. Each article includes a detailed abstract in English. However, a French translation of the summaries can be provided to readers on request. Summaries of all papers published in the revue from 1974 can be consulted on this site. Over 1 000 papers that have been published since 1997 are freely available in full text form (as pdf files). Currently, over 10 000 downloads are recorded per month.
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